Chocolate Cyst — Sweet Name, Serious Matter “Chocolate inside your ovaries” may sound like a dessert dream… but trust me, it’s anything but delicious. A chocolate cyst , medically called an endometrioma , forms when tissue similar to the uterine lining (the endometrium) grows inside the ovary. Each month, this tissue reacts just like it would inside the uterus — it bleeds. But unlike a period, the blood has nowhere to go. Over time, it gets trapped, thickens, and turns a dee